chore(gomall/tutorial): update code after video record #238

Job	Run time
resolve module	3s
compliant	20s
lint module (./easy_note)	1m 26s
lint module (./open-payment-platform)	1m 18s
lint module (./book-shop)	1m 26s
lint module (./gomall/app/cart)	1m 20s
lint module (./gomall/app/frontend)	1m 26s
lint module (./gomall/app/email)	1m 19s
lint module (./gomall/app/payment)	1m 25s
lint module (./gomall/app/order)	1m 18s
lint module (./gomall/app/user)	1m 21s
lint module (./gomall/app/checkout)	1m 21s
lint module (./gomall/app/product)	1m 24s
lint module (./gomall/common)	1m 10s
lint module (./bookinfo)	1m 33s
	18m 10s

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